Circuit board structure

Abstract

The utility model discloses a circuit board structure which comprises a first circuit board unit, a flexible board area and a connecting rib, the connecting rib is connected with the first circuit board unit and the flexible board area, a separation part is manufactured on the connecting rib, the separation part comprises a tearing opening and a connecting hole, and the tearing opening is connected with the flexible board area. The tearing opening is formed in the edge position of at least one side of the connecting rib in the length direction, and at least two connecting holes which are formed at intervals are formed in the extending side of the tearing opening in the width direction of the connecting rib; and a backstop structure is arranged at the joint of the first circuit board unit and the connecting rib. In the embodiment of the invention, the connecting rib can be torn off along the separating part from the position of the tearing opening during board splitting, so that board splitting operation can be simplified, and manual board splitting is facilitated. In addition, a stop structure is laid at the joint of the soft board area and the connecting rib, the situation that the soft board area is damaged in the process of tearing off the connecting rib can be effectively reduced, and the product quality of the rigid-flex board can be guaranteed.

Description

Technical Field

[0001] The present application relates to the technical field of PCB (Printed Circuit Board), and in particular to a circuit board structure. Background Art

[0002] In the related art, the rigid-flex board includes a hard board area and a soft board area. During the production process of the rigid-flex board, the hard board area and the soft board area are usually connected to the process border or another adjacent rigid-flex board unit through connecting ribs, so as to achieve the shipment of multiple rigid-flex board units to SMT (Surface Mounted Technology) manufacturers in the form of connected pieces, thereby improving the patch efficiency. After the components are soldered to the rigid-flex board product, the connecting ribs in the hard board area are usually removed by a milling machine, and the connecting ribs in the soft board area are usually removed by a laser or a mold. However, these two methods of removing connecting ribs are suitable for batch products. When the manufacturer does not have laser or mold equipment, or there are only a small number of products, scissors can only be used to remove the connecting ribs in the soft board area. However, this processing method can easily damage the unit position of the product, causing the product to be scrapped. Utility Model Content

[0003] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application proposes a circuit board structure that can realize manual board separation, simplify the board separation operation, and reduce the situation of product scrapping.

[0004] According to the circuit board structure of the embodiment of the present application, it includes: a first circuit board unit, a soft board area and a connecting rib, the connecting rib connects the first circuit board unit and the soft board area, a separation portion is made on the connecting rib, the separation portion includes a tearing hole and a connecting hole, the tearing hole is arranged at the edge position of at least one side of the connecting rib along the length direction, and at least two spaced connection holes are also arranged on the extended side of the tearing hole along the width direction of the connecting rib; wherein a stop structure is arranged at the junction of the first circuit board unit and the connecting rib.

[0005] Furthermore, the circuit board structure further comprises a covering film, wherein the covering film covers the soft board area, and along the length direction of the connecting rib, the covering film at least partially covers the stop structure.

[0006] Furthermore, the width of the stop structure is d, and along the length direction of the connecting rib, the width of the overlapping area between the covering film and the stop structure is L, satisfying: L≥0.8d.

[0007] Furthermore, the tearing opening is a slit or a notch, and the contour of the notch forms an angle, and the angle points to the connecting hole.

[0008] Furthermore, the tearing opening is a slit, and the length of the slit along the width direction of the connecting rib is 0.2 to 0.3 mm.

[0009] Furthermore, the connecting hole includes at least one of a circular hole, an elliptical hole, a waisted round hole, a polygonal hole and a cutting seam.

[0010] Furthermore, the connecting hole is a circular hole, and the diameter R of the circular hole is 0.1-0.15 mm.

[0011] Furthermore, another stop structure is provided at the junction of the soft board area and the connecting rib, the stop structure is laid on the connecting rib, and a side of the stop structure away from the soft board area is aligned with an edge of the first circuit board unit.

[0012] Furthermore, the stop structure is a copper bar, and the length of the copper bar is equal to the width of the connecting rib.

[0013] Furthermore, the width of the copper strip is 0.15-0.25 mm.

[0014] Furthermore, the connecting rib is made of polyimide.

[0015] The circuit board structure according to the embodiment of the present application has at least the following beneficial effects: a separation portion including a tearing hole and a connecting hole is processed on the connecting rib. Due to the setting of the tearing hole, the initial tearing strength of the connecting rib is reduced, and the initial force of tearing the connecting rib can be reduced; at the same time, since the connecting hole is also provided on the extended side of the tearing hole along the width direction of the connecting rib, the extended tearing strength of the connecting rib at the connecting hole can be reduced, and the connecting rib can be easily torn off. In this way, when splitting the board, the connecting rib can be torn off along the separation portion from the position of the tearing hole, thereby simplifying the board splitting operation and facilitating manual board splitting. In addition, a stop structure is laid at the junction of the soft board area and the connecting rib, and the stop structure has a large tearing strength. In this way, the situation of damaging the soft board area during the process of tearing off the connecting rib can be effectively reduced, which is beneficial to ensuring the product quality of the soft-hard combination board.

[0016] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present application is further described below with reference to the accompanying drawings and embodiments, wherein:

[0018] Figure 1 A schematic diagram of a circuit board structure according to an embodiment of the present application;

[0019] Figure 2 for Figure 1 A schematic diagram of the partially enlarged structure of part A;

[0020] Figure 3 for Figure 2 A schematic diagram of the local enlarged structure of part B;

[0021] Figure 4 This is a schematic diagram of the connection between the connecting rib, the first circuit board unit and the soft board area according to another embodiment of the present application;

[0022] Figure 5 for Figure 4 A partial enlarged schematic diagram of a circuit board structure;

[0023] Figure 6 This is a schematic diagram of the structure of a connecting rib according to another embodiment of the present application;

[0024] Figure 7 A schematic diagram of one of the manufacturing processes of a circuit board structure in one embodiment of the present application;

[0025] Figure 8 This is a schematic diagram of the circuit board structure of an embodiment of the present application.

[0026] Reference numerals:

[0027] 100, first circuit board unit; 110, cutting groove;

[0028] 200, soft board area;

[0029] 300, connecting rib; 311, tearing opening; 312, connecting hole; 320, stopping structure;

[0030] 400, hard board area;

[0031] 510, hard board core board; 520, soft board core board; 530, bonding sheet; 540, covering film; 550, tape protective film. DETAILED DESCRIPTION

[0032] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0033] In the description of the present application, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0034] In the description of this application, "several" means more than one, "more" means more than two, "greater than", "less than", "exceed", etc. are understood to exclude the number itself, and "above", "below", "within", etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0035] In the description of this application, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in this application based on the specific content of the technical solution.

[0036] In the description of the present application, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0037] In the related art, the rigid-flex board includes a hard board area and a soft board area. In the production process of the rigid-flex board, connecting ribs are usually set in the hard board area and the soft board area respectively, and the hard board area and the soft board area are connected to the process frame through the connecting ribs, and shipped to SMT (Surface Mounted Technology) manufacturers in the form of multiple rigid-flex board units, so as to improve the patch efficiency. After the SMT process is completed, the rigid-flex board will be separated from the process frame.

[0038] In the existing technical solutions, the connecting ribs connected to the hard board area are usually removed by milling machines, and the connecting ribs connected to the soft board area are removed by laser or mold. These two molding methods are suitable for mass production. However, when the manufacturer does not have laser or mold equipment, or only has a small number of products, only scissors can be used to remove the connection position of the soft board area. This method of board separation is easy to damage the unit position of the product, causing the product to be scrapped.

[0039] In view of this, the present application proposes a circuit board structure, which can improve the convenience of manual board separation and reduce product scrapping by designing the circuit board structure.

[0040] See also Figures 1 to 5As shown, the embodiment of the present application discloses a circuit board structure, including a first circuit board unit 100, a soft board area 200 and a connecting rib 300, wherein the connecting rib 300 connects the first circuit board unit 100 and the soft board area 200, and a separation portion is made on the connecting rib 300, wherein the separation portion includes a tearing opening 311 and a connecting hole 312, wherein the tearing opening 311 is arranged at the edge position of at least one side of the connecting rib 300 along the length direction, and at least two spaced connecting holes 312 are also arranged on the extended side of the tearing opening 311 along the width direction of the connecting rib 300. Among them, a stopper structure 320 is arranged at the junction of the first circuit board unit 100 and the connecting rib 300.

[0041] Specifically, the stop structure 320 is disposed at the junction of the connecting rib 300 and the soft board area 200, which can increase the tear resistance of the soft board area 200. The separation portion on the connecting rib 300 is located on the side of the stop structure 320 away from the soft board area 200, so that in the process of tearing the connecting rib 300, the actual tearing trajectory of the connecting rib 300 is inconsistent with the preset tearing trajectory, which can effectively avoid the situation that the soft board area 200 is damaged.

[0042] In the above embodiment, a cutting groove 110 is processed between the soft circuit board area 200 and the first circuit board unit 100 , and the soft circuit board area 200 is physically connected to the first circuit board unit 100 through the connecting ribs 300 .

[0043] In the circuit board structure of the embodiment of the present application, a separation portion including a tearing hole 311 and a connecting hole 312 is processed on the connecting rib 300. Due to the setting of the tearing hole 311, the initial tearing strength of the connecting rib 300 can be reduced, and the initial force of tearing the connecting rib 300 can be reduced; at the same time, since the connecting hole 312 is also provided on the extended side of the tearing hole 311 along the width direction of the connecting rib 300, the extended tearing strength of the connecting rib 300 at the connecting hole 312 can be reduced, and the connecting rib 300 can be easily torn off. In this way, when splitting the board, the connecting rib 300 can be torn off along the separation portion from the position of the tearing hole 311, thereby simplifying the board splitting operation and facilitating manual board splitting. In addition, a stop structure 320 is laid at the junction of the soft board area 200 and the connecting rib 300. The stop structure 320 has a large tearing strength. In this way, the situation of damaging the soft board area 200 in the process of tearing off the connecting rib 300 can be effectively reduced, which is conducive to ensuring the product quality of the soft-hard combination board.

[0044] In some embodiments of the present application, see Figure 1 The circuit board structure also includes a hard board area 400, which is connected to the soft board area 200 to form a hard-soft board.

[0045] In the embodiment of the present application, the soft board area 200 of the hard-flex board generally includes a soft board substrate and a cover film 540 , wherein the soft board substrate is composed of polyimide (PI) and copper, and the cover film 540 is composed of polyimide and glue.

[0046] It should be particularly noted that the flexible material of the soft board area 200 has a performance parameter of tear resistance. The greater the tear resistance of the material, the less likely the material is to tear during processing or use.

[0047] Among them, the material tear resistance includes two indicators: initial tear strength and extended tear strength. Initial tear strength refers to the force required for the film sample to tear in an intact state, and the unit is N / mm. Extended tear strength refers to the force required for the film sample that has been torn to continue to tear, and the unit is N / mm.

[0048] Through research, it is found that the tear resistance performance of the same soft board material under different stacking structures is shown in the following table:

[0049]

[0050] Unit:NN / mn

[0051] From the above table, it can be concluded that among the materials that make up the soft board, copper thickness is the main factor affecting the tear strength, followed by the thickness of the cover film 540, and finally the thickness of PI; at the same time, the extended tear strength is significantly lower than the initial tear strength value, indicating that after the soft board material is torn, the force required to continue tearing will be very small.

[0052] Based on the research data in the above table, in some embodiments of the present application, the material of the connecting rib 300 is selected as polyimide. In other words, the material of the connecting rib 300 is only the polyimide (PI) of the soft board substrate, that is, there is no copper foil at the position of the connecting rib 300. Therefore, the initial tear strength and extended tear strength of the material of the connecting rib 300 itself are lower than those of the first circuit board unit 100 or the soft board area 200. In this way, the connecting rib 300 is easier to tear than the first circuit board unit 100 or the soft board area 200, and the connecting rib 300 can be easily separated manually.

[0053] In some embodiments of the present application, see Figure 7 and Figure 8The circuit board structure also includes a covering film 540, which covers the soft board area 200, and along the length direction of the connecting rib 300, the covering film 540 at least partially covers the stop structure 320. In this way, the stop structure 320 can be firmly connected to the soft board area 200, so as to better protect the soft board area 200 from being damaged during the tearing process of the connecting rib 300, and can also effectively prevent the stop structure 320 from being lifted up or separated from the soft board area 200 during the tearing process of the connecting rib 300. In some embodiments of the present application, see Figure 4 and Figure 5 , the width of the stop structure 320 is d, and the width of the overlapping area of ​​the cover film 540 and the stop structure 320 along the length direction of the connecting rib 300 is L, which satisfies: L ≥ 0.8d. In this way, the connection between the stop structure 320 and the soft board area 200 can be more stable, thereby better protecting the soft board area 200 from being damaged during the tearing process of the connecting rib 300.

[0054] It is worth understanding that, in order to ensure that the soft board area 200 is not damaged during the tearing of the connecting rib 300, the edge of the stop structure 320 can be flush with the edge of the soft board area 200, or can partially extend out of the soft board area 200. Further, when the stop structure 320 partially extends out of the edge of the soft board area 200, the soft board area 200 can be further prevented from being damaged.

[0055] It should be pointed out that in Figure 4 and Figure 5 In the figure, the X direction refers to the length direction of the connecting rib 300, and the Y direction refers to the width direction of the connecting rib 300.

[0056] In some embodiments of the present application, see Figures 2 to 5 As shown, the tearing opening 311 is a slit or a notch, and the outline of the notch forms an angle, and the angle points to the connection hole 312. Specifically, the setting of the tearing opening 311 can reduce the initial tearing strength of the connecting rib 300, and can reduce the initial force of tearing the connecting rib 300. At the same time, the slit or sharp notch extends along the Y direction, which can guide the tearing trajectory when tearing the connecting rib 300, so that the actual tearing trajectory of the connecting rib 300 can extend from the tearing opening 311 to the next connection hole 312, thereby effectively avoiding the situation where the soft board area 200 is damaged when tearing off the soft board area 200.

[0057] For some of the implementations, see Figure 2 and Figure 3As shown, the tear 311 is a slit, and the length of the slit along the width direction of the connecting rib 300 is 0.2-0.3 mm. Specifically, the slit extends from the edge of the connecting rib 300 along the width direction of the connecting rib 300 toward the middle of the connecting rib 300. The connecting rib 300 is also provided with at least two connecting holes 312, and the at least two connecting holes 312 are arranged at intervals along the width direction of the connecting rib 300. Specifically, the slit can be processed on the connecting rib 300 using laser processing equipment. Of course, the slit can also be processed using other processing methods and processing equipment.

[0058] As some other embodiments, see Figure 4 and Figure 5 As shown, the tearing opening 311 is specifically a notch. Specifically, an angle is formed between the contour lines of the notch instead of a smooth transition. The extended side of the angle along the width direction of the connecting rib 300 is the connecting hole 312, wherein the width direction of the connecting rib 300 is the Y direction in the figure. It is worth understanding that the angle can reduce the tearing strength of the connecting rib 300 along the width direction, and when separating the connecting rib 300, it is convenient to tear the connecting rib 300 along the tearing opening 311.

[0059] In practical applications, the outline of the tear 311 can be an equilateral triangle or an isosceles triangle, or a notch formed by the intersection of other curves pointing to the connection hole 312. Exemplarily, the tear 311 is an equilateral triangle, and the vertex of the equilateral triangle points to the connection hole 312 on one side along the Y direction.

[0060] In some embodiments of the present application, the connecting hole 312 includes at least one of a circular hole, an elliptical hole, a round hole, a polygon and a cutting seam. Specifically, each connecting hole 312 is sequentially arranged on the connecting rib 300, and the trajectory of each connecting hole 312 is the preset tearing trajectory of the connecting rib 300 when it is torn. Among them, a portion of the connecting rib 300 is retained between two adjacent connecting holes 312, and this portion of the connecting rib 300 can provide a physical connection for the connecting ribs 300 on both sides of the separation portion. It is worth understanding that each connecting hole 312 is sequentially spaced apart, and the distance between two adjacent connecting holes 312 should not be too large to prevent the actual tearing trajectory of the connecting rib 300 from deviating from the preset tearing trajectory.

[0061] For some examples, see Figures 2 to 5 As shown, the connection hole 312 is a circular hole, and the diameter R of the circular hole is 0.1-0.15 mm. Specifically, the connection rib 300 is provided with tearing holes 311 on both sides along the length direction, and a plurality of circular holes are provided at intervals along the Y direction between the two tearing holes 311, that is, each circular hole is located on the line between the two tearing holes 311.

[0062] As another example, see Figure 6As shown, the connection hole 312 is a cutting seam. The cutting seam is processed by laser equipment. It is worth understanding that the cutting seam can also be processed by other equipment such as punching equipment.

[0063] In some embodiments of the present application, see Figures 2 to 5 As shown, another stop structure 320 is provided at the junction of the soft board area 200 and the connecting rib 300. The stop structure 320 is laid on the connecting rib 300, and the side of the stop structure 320 away from the soft board area 200 is aligned with the edge of the first circuit board unit 100. Specifically, the connecting ribs 300 on both sides of the separation portion along the Y direction are respectively provided with stop structures 320, which can effectively increase the tear strength of the connecting ribs 300 at this position. In the actual board separation process, if the connecting rib 300 deviates from the preset tearing track during the tearing process, the stop structures 320 on both sides can effectively prevent the tearing track from extending to the first circuit board unit 100 or the soft board area 200 on one side of the stop structure 320, thereby effectively protecting the first circuit board unit 100 and the soft board area 200.

[0064] In some of these embodiments, please continue to see Figures 2 to 5 As shown, the stop structure 320 is a copper strip, and the length of the copper strip is equal to the width of the connecting rib 300. It is worth understanding that the tear strength of the copper strip is much greater than the tear strength of the connecting rib 300 made of only PI material. Therefore, the tear strength of the connecting rib 300 after the copper strip is provided can be greatly improved compared with the connecting rib 300 itself, so that the actual tearing track of the separation portion can be limited to the area of ​​only the connecting rib 300.

[0065] The width of the connecting rib 300 refers to the length of the connecting rib 300 in the Y direction, and the length of the copper strip refers to the length of the copper strip along the Y direction. The length of the copper strip is equal to the width of the connecting rib 300, which further ensures that the tearing track of the connecting rib 300 cannot extend to the first circuit board unit 100 and the soft board area 200 on one side of the copper strip, which helps to further protect the first circuit board unit 100 and the soft board area 200.

[0066] Further, see Figures 2 to 5 As shown, the width of the copper strip is 0.15-0.25 mm. The width of the copper strip refers to the length of the copper strip along the X direction.

[0067] In some other embodiments, the stop structure 320 may also be other metal sheets or plastic parts with higher tear resistance.

[0068] In some embodiments of the present application, the following steps are included when manufacturing a circuit board structure:

[0069] S110: providing a semi-finished PCB product, wherein the semi-finished PCB product comprises a first circuit board unit 100, a soft board area 200 and a connecting rib 300, wherein the connecting rib 300 is connected between the first circuit board unit 100 and the soft board area 200, and a connection between the soft board area 200 and the connecting rib 300 is covered with a copper strip;

[0070] 120: A separation portion is made on the connecting rib 300, the separation portion includes a tearing hole 311 and a connecting hole 312, the tearing hole 311 is arranged at an edge position of at least one side of the connecting rib 300 along the length direction, and at least two spaced connecting holes 312 are arranged on the extended side of the tearing hole 311 along the width direction of the connecting rib 300;

[0071] S130 : tearing off the connection rib 300 from the position of the tearing opening 311 , so as to separate the soft circuit board area 200 from the first circuit board unit 100 .

[0072] It should be pointed out that the material of the connecting rib 300 is only polyimide (PI) of the soft board substrate, that is, there is no copper foil at the position of the connecting rib 300, that is, the tear strength of the connecting rib 300's own material is lower than that of the first circuit board unit 100 or the soft board area 200. In this way, the connecting rib 300 is easier to tear than the first circuit board unit 100 or the soft board area 200, and the connecting rib 300 can be conveniently separated manually.

[0073] It should be noted that the copper strip in the embodiment of the present application is not electrically connected to the first circuit board unit 100 and the unit circuits in the flexible circuit area 200 .

[0074] Furthermore, the step of providing a semi-finished PCB product includes:

[0075] S111: Provide a hard board core board 510, an adhesive sheet 530, a soft board core board 520 and a copper strip, lay the copper strip at the junction of the soft board area 200 and the connecting rib 300 of the soft board core board 520, and then sequentially attach a covering film 540 and a tape protective film 550 to the soft board area 200, wherein the covering film 540 at least partially covers the copper strip.

[0076] In a possible implementation, each hard board core board 510 and each soft board core board 520 are etched to produce circuits, and then a cover film 540 and a tape protective film 550 are attached to the soft board core board 520, and the bonding sheet 530 is milled. The number of the hard board core boards 510 can be set to one or more as needed.

[0077] S112: Press the hard board core board, the bonding sheet and the soft board core board, and then mill the stepped grooves to expose the soft board area.

[0078] In the embodiment of the present application, the first circuit board unit 100 may be a process frame unit, or may be a hard board area or a soft board area of ​​another hard-flex board, which is not limited here.

[0079] The embodiments of the present application are described in detail above in conjunction with the accompanying drawings, but the present application is not limited to the above embodiments. Various changes can be made within the knowledge of ordinary technicians in the relevant technical field without departing from the purpose of the present application. In addition, the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

Claims

1. A circuit board structure, characterized in that: include: A first circuit board unit, a soft board area and a connecting rib, wherein the connecting rib connects the first circuit board unit and the soft board area, a separation portion is formed on the connecting rib, and the separation portion includes a tearing hole and a connecting hole, the tearing hole is arranged at an edge position of at least one side of the connecting rib along the length direction, and at least two spaced connecting holes are arranged on the extended side of the tearing hole along the width direction of the connecting rib; wherein a stop structure is arranged at the junction of the first circuit board unit and the connecting rib.

2. The circuit board structure according to claim 1, characterized in that: The circuit board structure further includes a covering film, which covers the soft board area and at least partially covers the stop structure along the length direction of the connecting rib.

3. The circuit board structure according to claim 2, characterized in that: The width of the stop structure is d, and along the length direction of the connecting rib, the width of the overlapping area between the covering film and the stop structure is L, which satisfies: L≥0.8d.

4. The circuit board structure according to claim 1, characterized in that: The tearing opening is a slit or a notch, and the notch and the outline of the notch form an angle, and the angle points to the connecting hole.

5. The circuit board structure according to claim 4, characterized in that: The tearing opening is a slit, and the length of the slit along the width direction of the connecting rib is 0.2-0.3 mm.

6. The circuit board structure according to claim 1, characterized in that: The connecting hole includes at least one of a circular hole, an elliptical hole, a waisted circular hole, a polygonal hole and a cutting seam.

7. The circuit board structure according to claim 6, characterized in that: The connecting hole is a circular hole, and the diameter R of the circular hole is 0.1-0.15 mm.

8. The circuit board structure according to claim 1, characterized in that: Another stop structure is provided at the junction of the soft board area and the connecting rib. The stop structure is laid on the connecting rib, and a side of the stop structure away from the soft board area is aligned with an edge of the first circuit board unit.

9. The circuit board structure according to claim 1 or 8, characterized in that: The stop structure is a copper bar, and the length of the copper bar is equal to the width of the connecting rib.

10. The circuit board structure according to claim 9, characterized in that: The width of the copper strip is 0.15-0.25 mm; and / or the connecting rib is made of polyimide.

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